— I can’t get through to the general manager’s office.—The line is busy. Someone ________ the telephone.
#76155
A
must have used
B
could use
C
could have used
D
must be using
推荐题目
—Shall we go to visit Mr. Wang now?—Mr. Wang________here now. He left for Shanghai by air this morning.
#76795
A
must be
B
can be
C
mustn’t
D
can’t be
I __________use a clock to wake me up because at six o'clock each morning the train comes by my house.
#63362
A
couldn’t
B
mustn’t
C
shouldn’t
D
needn’t
---Fifty dollars for such a T-shirt! You _______ be joking!---I’m serious．It’s made of silk.
#75661
A
must
B
need
C
may
D
Can
A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
#62333
A
may have been
B
must be
C
need have been
D
might be